In my experience, being around people that I care about, maybe a girlfriend or friend, and crying helped me when a family member died. My best friend at the time just chilled with me and made me feel better.
Getting lost in a movie or television show usually helps me too. A good movie can allow you to block everything else out and focus on that when you just need a break from being sad for a while.
Once you get strong enough to sit down and just think for a while, do it. Remember the good times that you had with him, be thankful you had the chance to meet him, and enjoy the memories.
I think the biggest key is to not let the whole "YOU'RE A MAN, YOU MUST BE STRONG" stigma interfere with the grieving process. Laugh. Cry. Cry some more. Laugh some more. Let the emotions flow out, it'll help you get over it.
Sorry about your loss man, that sucks.
(PS, you could always masturbate )